Maynard, MA, USA: Beacon-Villager newspaper column on local history, observations on nature and recreational activities, plus an occasional health-related article. Columns from 2009-11 collected into book "MAYNARD: History and Life Outdoors." Columns from 2012-14 collected into book "Hidden History of Maynard." - David A. Mark

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Thursday, May 8, 2014

A Cleaner River - the Assabet Transformed

Moss in early Spring, wetlands near Assabet River

In its natural state the Assabet was a glorious little river,
but historically it took awhile to settle on a name. Old maps show Assabeth,
Asabet, Elizbeth, Elizabet…all thought to be Anglicized versions of an
Algonquin Indian name. One of the alternative names is preserved in Elizabeth Brook, a tributary that flows southwards through Stow before merging into the Assabet River.

Nathaniel Hawthorne wrote: “Rowing our boat against the current,
between wide meadows, we turn aside into the Assabeth. A more lovely stream
than this, for a mile above its junction with the Concord, has never flowed on earth.”

Given its modest length and modest volume, the Assabet was
an extremely 'worked' river, meaning that little remains of its original
natural state. From the headwaters, where a dam insures less flow in times of
flood and more flow in times of drought, to the conflux 31 miles and 220 feet
lower in elevation where it merges with the Sudbury River to become the Concord
River, the Assabet had powered eight mills, has its high water rampages hobbled
by flood control dams, suffered channeling between restraining walls through
the centers of Hudson and Maynard, lost water to our various usages, and gained
water back from our numerous waste streams.

From Thoreau's journal entry in 1859: "So completely
emasculated and demoralized is our river that it is even made to observe the
Christian Sabbath... for then the river runs lowest owing to the factory and
mill gates being shut. Not only the operatives make the Sunday a day of rest
but the river too, to some extent, so that the very fishes feel the
influence...of man's religion." His point here is that natural flow was
stopped Sundays so as to back up as much water as possible before work started
again Monday morning.

The Assabet was also an extremely polluted river. As Ann
Zwinger wrote in A Conscious Stillness
(1982) "...the reach above the Powder Mill Dam is closed by joint action
of the Maynard and Acton
boards of health...the river smell is nauseating, reeking like an unpumped-out
campground outhouse times ten."

By then, the issue was no longer industrial pollution left
over from the mills that had dotted the AssabetRiver
and its tributaries. Rather, the smells emanated from rotting of bacteria,
algae and water plants such as duckweed - the consequence of eutrophic growth
promoted by the excesses of phosphorus and nitrogen entering the water from
wastewater treatment plants (WWTPs). Five of these return cleaned water to the
Assabet. Their combined volume is so great that in the low flow months of
summer much of the river water is processed water. Surface water run-off of
fertilizer from farms, golf courses and lawns also contributes unwanted
nutrients, as does untreated stormwater from roads and parking lots.

Assabet River channeled through the center of Maynard, 2010 flood.

Until quite recently the limits on phosphorus content of
processed water were not stringent enough to lower the rampant warm weather plant
growth. But starting in 2009 and completed in 2014, all of the WWTPs on the AssabetRiver now meet higher standards.

Furthermore, effective January 1, 2014, lawn fertilizer purchased or used in Massachusetts may no
longer contain phosphorus. Mid-summer phosphorus content in the river has decreased
from 0.4-0.8 milligrams per liter to about 0.1 mg/L. A target for a healthy
river is to get below 0.025 mg/L. Large amounts of sediment trapped behind dams
harbors reserves of phosphorus and nitrogen, thus slowing the trend to a healthier
river, but over time the water quality will continue to improve.

All this focus on plant growth is not to say that local
rivers had never suffered from industrial insult. Back in the day, wool arrived
in Maynard unwashed. Cleaning it at the factory meant all the lanolin, dirt,
urine and feces matted into the fleece ended up in the river, along with the chemical
dyes and whatever. Children frolicked in the river behind the MainStreetSchool (where Town Hall
is now), but not downstream of the mill.

Spring 2014: Kayaker on Assabet between
Main Street and the footbridge

One saving grace - the Assabet did not suffer the extensive mercury
dumping that still haunts the SudburyRiver. From 1917 to 1978
the Nyanza Color & Chemical Company operated a textile dye manufacturing
factory in Ashland.
Wastewater entered the SudburyRiver via a tributary
named Chemical Brook (how apt). The Environmental Protection Agency estimates
that 45 to 57 metric tons of mercury were released to the SudburyRiver.
Other contaminants included chromium, arsenic, lead, and carcinogenic chemicals.
The current advisory: "The general public should not consume any fish from
this water body."

OARS clean up, Maynard, 2012
Click on any photo to enlarge

Solid waste trash also contributed to the Assabet's lack of
ambiance. In Maynard alone, decades of annual river clean-ups organized by the
Organization for the Assabet, Sudbury
and Concord Rivers (OARS) have removed more than 1,000 car and truck tires,
tons of metal scrap and hundreds upon hundreds of pounds of broken glass.
Intact glass bottles from 50-60 years ago have come out of the river. Ditto
televisions, bicycles, shopping carts, beer cans... Cleaning up the river appears
contagious, in that each year less new trash goes into the river.

Coda: Fishing boating, canoeing or kayaking on the Assabet River all popular pastimes. Site [http://www.oars3rivers.org/river/recreation] has maps and guides to boat access points. The fishing information includes where on the rivers it is safe or unsafe to eat fish. In addition to the marked boating areas, local kayakers know that at just the right water levels it is possible to enjoy Class I-II rapids through the center of Maynard by putting in below the Ben Smith Dam. If water too low, cannot get past the shallows. If water too high there is not enough clearance under the sewage pipes that run under some of the bridges.

Mill Street Bridge, Assabet River in flood, Spring 2010
Water depth was 7.1 feet at the gauge when this photo was taken.